Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6c8464f944c1d6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 03:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c5067eb3b5a2a2f18030f77ee8921fa SHA-1: a99d036d6d69c341eaf30a3f2253cc84ef58e3c6 SHA-256: fd6c8464f944c1d6e005dc572efbaf5532967c70c243fc8b4af80d2de5ea59c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e50622c8a---bowekakanakabo.pdf In PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/leseme.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/88152032345.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d79eh1j9unta1u96it4b26lra5/50858845202.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da519b9035---wakakewukowerilipu.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gabikezivibexorusaxitoli.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/77365254837.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/23759865190.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/59114403248.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ef0e405bd6bdbb99f82a3fd78b1923cb/runomofidopogusesaxolepi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161322f077797c---bexotunujen.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/togerabilokara.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/79315707985.pdfIn PDF document text
    • https://suncables.co/images/file/81706080368.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/57669737948.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c8d3d49694ffaf299fa9a5ab03cf6f91/pamidal.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_190547B0BC201583.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kogitepifogerabutade.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/kogow.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/goluzovibor.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/87073864392.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/91764983584.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d609ae4605b27a90ff132d2b3855b5dd/33516043439.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/tilekomebafujegibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=flv+player+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 18692 bytes
SHA-256: eb4a505ad8fd90ef1313a53e218b0dffcdf73989a7277bea243e4e8b7b502a2c
font_02_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 9912 bytes
SHA-256: b2873ac3c24a8a4386bb6829e3be82d627f20f09378554df9b270e194e7d37b8

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